/*
 * Copyright (C) 2019 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.android.tools.idea.uibuilder.palette;

import com.android.tools.idea.uibuilder.palette.Palette;
import com.intellij.openapi.util.Condition;
import com.intellij.ui.SpeedSearchComparator;
import org.jetbrains.annotations.NotNull;

/**
 * A filter condition for implementing search in the palette.
 */
public class PatternFilter implements Condition<Palette.Item> {
  private final SpeedSearchComparator myComparator;
  private String myPattern;

  public PatternFilter() {
    myComparator = new SpeedSearchComparator(false);
    myPattern = "";
  }

  public boolean setPattern(@NotNull String pattern) {
    if (pattern.equals(myPattern)) {
      return false;
    }

    myPattern = pattern;
    return true;
  }

  @Override
  public boolean value(@NotNull Palette.Item item) {
    return myPattern.isEmpty() ||
           myComparator.matchingFragments(myPattern, item.getTitle()) != null ||
           !item.getTitle().equals(item.getTagName()) && myComparator.matchingFragments(myPattern, item.getTagName()) != null ||
           item.getMetaTags().stream().anyMatch(meta -> myComparator.matchingFragments(myPattern, meta) != null);
  }

  public boolean hasPattern() {
    return !myPattern.isEmpty();
  }
}
